New relative importance of water quality variables in Langat River
The relative importance of s ix water quality variables was considered in a Water Quality Index (WQI) calculation by the Malaysian Department of Environment (DOE). This comprised: Dissolved Oxygen (DO), Biochemical Ox ygen Demand (BOD), Chemical Oxygen Demand (COD), Suspended Solid (SS),...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
World Academy of Research and Publication
2013
|
| Online Access: | http://psasir.upm.edu.my/id/eprint/28915/1/New%20relative%20importance%20of%20water%20quality%20variables%20in%20Langat%20River.pdf |
| _version_ | 1825947409711104000 |
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| author | Mohd Ali, Zalina Ibrahim, Noor Akma Mengersen, Kerrie Shitan, Mahendran Juahir, Hafizan |
| author_facet | Mohd Ali, Zalina Ibrahim, Noor Akma Mengersen, Kerrie Shitan, Mahendran Juahir, Hafizan |
| author_sort | Mohd Ali, Zalina |
| collection | UPM |
| description | The relative importance of s
ix water quality
variables
was
considered in
a
Water Quality Index (WQI) calculation by the Malaysian
Department of Environment (DOE).
This comprised:
Dissolved Oxygen (DO), Biochemical Ox
ygen Demand (BOD), Chemical
Oxygen Demand (COD), Suspended Solid (SS), potential of Hydrogen (pH) and Ammonia (AN). The relative importance established
in the formula
was
based on expert opinions, very subjective in nature
,
and do not consider the interrel
ationships among the variables.
The relationships of the variables are important due to the nature of multidimensionality
and
complex characteristics
found
in river
water. In the study, water quality
indices
were clustered into three natural groupings iden
tified by high-pollution sources (HPS),
moderate-pollution sources and low-pollution sources. The prior information of natural groupings based on cluster analysis, CA
,
was
then used in discriminant analysis, DA
. This
obtained
the related linear combinations of the six main variables in WQI formula, i.e.
discriminant functions that best separate the three identified groups.
Apart from that, the summary index based on the
interrelationships among the variables from DA indicates the difference
in
ranking of the relative impor
tance for each variable
compared
to the classical approaches used in WQI-DOE. We firmly believe that the results obtained can be used as a guide
to
investigate other influential available variables in
the water quality of
Langat River. |
| first_indexed | 2024-03-06T08:12:56Z |
| format | Article |
| id | upm.eprints-28915 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T08:12:56Z |
| publishDate | 2013 |
| publisher | World Academy of Research and Publication |
| record_format | dspace |
| spelling | upm.eprints-289152015-10-08T06:25:28Z http://psasir.upm.edu.my/id/eprint/28915/ New relative importance of water quality variables in Langat River Mohd Ali, Zalina Ibrahim, Noor Akma Mengersen, Kerrie Shitan, Mahendran Juahir, Hafizan The relative importance of s ix water quality variables was considered in a Water Quality Index (WQI) calculation by the Malaysian Department of Environment (DOE). This comprised: Dissolved Oxygen (DO), Biochemical Ox ygen Demand (BOD), Chemical Oxygen Demand (COD), Suspended Solid (SS), potential of Hydrogen (pH) and Ammonia (AN). The relative importance established in the formula was based on expert opinions, very subjective in nature , and do not consider the interrel ationships among the variables. The relationships of the variables are important due to the nature of multidimensionality and complex characteristics found in river water. In the study, water quality indices were clustered into three natural groupings iden tified by high-pollution sources (HPS), moderate-pollution sources and low-pollution sources. The prior information of natural groupings based on cluster analysis, CA , was then used in discriminant analysis, DA . This obtained the related linear combinations of the six main variables in WQI formula, i.e. discriminant functions that best separate the three identified groups. Apart from that, the summary index based on the interrelationships among the variables from DA indicates the difference in ranking of the relative impor tance for each variable compared to the classical approaches used in WQI-DOE. We firmly believe that the results obtained can be used as a guide to investigate other influential available variables in the water quality of Langat River. World Academy of Research and Publication 2013 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/28915/1/New%20relative%20importance%20of%20water%20quality%20variables%20in%20Langat%20River.pdf Mohd Ali, Zalina and Ibrahim, Noor Akma and Mengersen, Kerrie and Shitan, Mahendran and Juahir, Hafizan (2013) New relative importance of water quality variables in Langat River. International Journal of Chemical and Environmental Engineering, 4 (1). pp. 25-31. ISSN 2078-0737 http://www.warponline.org/viewjc.php?id=j1&page_id=23&volume_id=15&content_id=181 |
| spellingShingle | Mohd Ali, Zalina Ibrahim, Noor Akma Mengersen, Kerrie Shitan, Mahendran Juahir, Hafizan New relative importance of water quality variables in Langat River |
| title | New relative importance of water quality variables in Langat River |
| title_full | New relative importance of water quality variables in Langat River |
| title_fullStr | New relative importance of water quality variables in Langat River |
| title_full_unstemmed | New relative importance of water quality variables in Langat River |
| title_short | New relative importance of water quality variables in Langat River |
| title_sort | new relative importance of water quality variables in langat river |
| url | http://psasir.upm.edu.my/id/eprint/28915/1/New%20relative%20importance%20of%20water%20quality%20variables%20in%20Langat%20River.pdf |
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